空氣電磁加熱器影響因素

      1.增大空氣加熱器的氣體入口流速，能夠加強空氣電加熱器對(dui)流換(huan)熱(re)(re)(re)(re)(re)，而降低了(le)空(kong)(kong)(kong)氣加(jia)熱(re)(re)(re)(re)(re)器(qi)(qi)內電熱(re)(re)(re)(re)(re)元件(jian)表(biao)面溫度(du)，不僅有利于(yu)延長(chang)空(kong)(kong)(kong)氣加(jia)熱(re)(re)(re)(re)(re)器(qi)(qi)電熱(re)(re)(re)(re)(re)元件(jian)的使(shi)(shi)用(yong)壽命，而且使(shi)(shi)得(de)空(kong)(kong)(kong)氣電加(jia)熱(re)(re)(re)(re)(re)器(qi)(qi)散熱(re)(re)(re)(re)(re)損失減小，因而空(kong)(kong)(kong)氣換(huan)熱(re)(re)(re)(re)(re)器(qi)(qi)的效(xiao)率提高(gao)了(le)，但速(su)度(du)如(ru)果過大，使(shi)(shi)得(de)壓力損失陡(dou)增，這將不利于(yu)加(jia)熱(re)(re)(re)(re)(re)效(xiao)率的提高(gao)。

     2.若其它條件(jian)不變(bian)，改變(bian)表(biao)(biao)(biao)面負(fu)(fu)荷(he)，空氣加(jia)(jia)(jia)熱(re)(re)(re)(re)器中(zhong)(zhong)電(dian)熱(re)(re)(re)(re)元件(jian)的(de)壁(bi)溫(wen)將(jiang)呈直線變(bian)化，如(ru)果(guo)表(biao)(biao)(biao)面負(fu)(fu)荷(he)增大，電(dian)熱(re)(re)(re)(re)元件(jian)的(de)壁(bi)溫(wen)將(jiang)增大，這(zhe)將(jiang)降(jiang)低(di)(di)(di)空氣加(jia)(jia)(jia)熱(re)(re)(re)(re)器中(zhong)(zhong)電(dian)熱(re)(re)(re)(re)元件(jian)的(de)使用壽(shou)命(ming)，但是如(ru)果(guo)表(biao)(biao)(biao)面負(fu)(fu)荷(he)過(guo)(guo)小，壁(bi)溫(wen)過(guo)(guo)低(di)(di)(di)，空氣加(jia)(jia)(jia)熱(re)(re)(re)(re)器換熱(re)(re)(re)(re)器的(de)效率又降(jiang)低(di)(di)(di)了，所以(yi)空氣加(jia)(jia)(jia)熱(re)(re)(re)(re)器中(zhong)(zhong)電(dian)熱(re)(re)(re)(re)元件(jian)的(de)表(biao)(biao)(biao)面負(fu)(fu)荷(he)的(de)選(xuan)擇比(bi)較重要。

     3.空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)器(qi)(qi)中空(kong)(kong)氣(qi)終溫T2提(ti)高時，由于空(kong)(kong)氣(qi)粘性增加(jia)(jia)，氣(qi)體雷諾數減小(xiao)，使得(de)(de)對流換(huan)熱(re)(re)(re)強度(du)降(jiang)低(di)，空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)器(qi)(qi)中電(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)(jian)的表(biao)面溫度(du)同時上(shang)升，紅外碳硫分(fen)析儀使得(de)(de)散熱(re)(re)(re)損失增加(jia)(jia)，從(cong)而降(jiang)低(di)換(huan)熱(re)(re)(re)器(qi)(qi)的效率。當T2提(ti)高過大(da)時，電(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)(jian)表(biao)面的溫度(du)亦會大(da)大(da)升高，致使一般電(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)(jian)無法承受，故T2的增加(jia)(jia)通常受到空(kong)(kong)氣(qi)加(jia)(jia)熱(re)(re)(re)器(qi)(qi)中電(dian)熱(re)(re)(re)元(yuan)件(jian)(jian)(jian)材料耐熱(re)(re)(re)性能的限制。